Compensating winding for polyphase commutator-machines with drum-armatures.



vIEYER-DE-LIUS. GOMPENSATING WINDING POR POLYPHASE CGMMUTATOB MACHINES WITH DRUM ABMATURES.

APTLICATION FILED LIAR. 24, i910.

Patented Nov. 2%, NM.

SHBETSSHEET l.

O poihve 65 We H. MEYER-DELIUS` GOMPBNSATING WINDING EGR PGLYPHASE GOMMUTATOR MACHINES WITH DRUM ARMATUHBS,

APPLOATION FILED KAR 24. 1910.

MEYER-DREES.

ATNG WINDING FOR POLEYPHASE GOMMUTLJOR CMPENS MACHINES WITH DRUM ARMATURES,

' APRLIGATIQN FILED MAR4 24, 1910.

Patented Nov. 24, 1914.

3 SHEBTSSHEBT 3.

estamos.

l `=EYEB,-DELI'US, F SABEN, SITZERLAND, MENTS, '170 GENERAL ELECTRIC COMPANY,

ASSEGNOR, BY MESNE ASSIGN- A CORORATEON F NEW' YORK.

Specification of Letters Eatent.

pplicaton tiled varch 24, 19:10. Sera No. 55,335.

To QU frigo/ie 'it maj/ concern.:

Be it known that i, iin-infuori MEYER- Deniesj a subject oli the Emperor of Germany, and residing at `Hotel Bli'dre, isaden, Switzerland. have invented a cer` tain new and nse'iinl Compensating 1i'inding for Poilvphase Commatator-iiachines with Druni-rmatnres, of 1which the following is a specification.

rthis .invention relates to the compensation of poljfpliase commutator machines with drinn armatures by' means oi a compensatingnr winding. Y

in prdyphase comnnitator motors having drinn armatures the compensating winding arranged on the stator must be composed of sections carrying current of different phases. The endeavor has hitherto been made to realize this object b v using a kind of coil Winding or concentrated .vindings. Such coii windings have the diszdvantage that they are diiiicult to manufacture as in polyphase arrangements they: possess manv crossings.

The object of the present invention is to obtain an improved winding,- for the purpose referred to ahofe.

in order properly to compensate the ampere laars or conductors of' the drum armature (arranged in delta connectioni o v the brush currents (with a drum Winding) in the stator, the stator Winding for each diif'ision or portion oi" the s" E'or mast include conductors carrying currents of each phase.

in accordance 1.riti my invention, l provide the coininutator machine with a compensating Winding which comprises a two part dr .m Winding which is opened Aup at certain points and then so connected that each brush Current iiows in series through one section ot one part of said Windinpand then throne-h a section oi the other aart of said Winding in the reverse direction and so that ever 1 art ot the stator has ad'acent windings receiving current from three ditferent phares or each ot the phases employed. in the specification, when i speak of current from all the different phases. I mean that every part of' the stator shall have adjacent windings which are traversed hv currents displaced from each other by 3.2i) electrical degrees.

'lfhe invention also consists 1n the nnproved compensating scribed Aherein and more out in the ciaims Referring non' to the accompanying drawings, Figure l diagrammatically represents the current vectors. Fig. 2 is a diagrain of connections for a drum armature ivound for three-phase current accormng to one form of the present invention. Fig. 3 shows a compensating arrangement for the armature of Fig. :2. Fig. '-.L is a vector diagram showing the relation between the armature and compensating currents. Fig. 5 represents a modified manner of carrying the invention into effect apjiiied to a sin pole machine with a wavey winding.

in Fig. l, il, 2, 3, indicato the vectors of the three currents which tiow inthn three ju je?. in'

despeeihoaily pointed appended hereto.

arrangements armature circuits. The vectors dicate the brush currentsnhich after eaving,r the brushes, .dow through the various circuits of the compensating- Winding.

In Fig. 2 the conductors momentariiy carrying the armature current il are indicated by full lines (connecting theends of the armatore bars) While those carrying the armature current 2 are indicated by dash lines and those carrying armature current 2'; by chain lines. The hianif circles (which iiiustrate the ari'nai'nure hars oi conductors) indicate that the vectors et 4the armature currents in Fig'. fi. are o he counted as positive. while the circles marked with crosses are to indicate that the vvectors oi the armature currents are to he considered as negative. ISuch a convention is used because the currents may rio/W both from rear to front as Well as from 'iront to rear., which corresponds to a shitting` of the vector die.- gram through 1800.

Fig. 3 shows a compensating Winding connected to the mains at terminais L Il and Hl which is capabic of compensating the armature shown inr 2. .i nature brush currents jl, j... tion: thronfgi the compensating winding' shown .in Fig. 3. The armature bars or conductors are marked in a special manner the meaning oi' which markings shown on the drawing and commutation poles are indicated in heavy lines.

It can easily he ascertained from Figs. l toi that thefstator heid fhown'in Fig. it

compensates the fisici shown in 3 are indicated in these figures by the circles l which are drawn around them.

If Figs. 2 and 3 be compared with the diagram shown in' Fig. l, and if the vectors of the currents flowing in the six and four circuits of the rotor and stator respectively be combined, the diagram shown in Fig. 4 will result. From this it will be seen that the vectorial sum of the four vectors ofthe stator currents j balances the six vectors of the rotor currents 1I that is to say theresultant of the currents i is equal to the resultant of the currents j and is of opposite direction.

After having proved that the stator winding shown in Fig. 3 results in a correct compensation it remains to be shown how such a winding can. be obtained. From Fig. 3 it will be seen that the compensating winding is a multipart winding here shown as comprising two parallel strands or parts, one indicated by thick lines and the other by thin lines. vThe partsof this winding are shown as wound in alternate slots, but it is only essential that the active portions of one part be always adjacent those of the other parts, and if desired the slots might be combined. The two strands would form two perfectly independent closed or complete windings, made up of coils of equal pitch, if they were not cut open anywhere which can easily be appreciated if it is imagined that the windings are connected at the crossing points where the circles fa are shown. These twI windings are however cut open at the points indicated by these circles a and the sections thus produced are so connected by the connectors u1, u2, and ua,

that each brush current flows in series through one section of one strand and then through a section of the other strand. Each of these sections extends over approximately 240 electrical'd'egrees and the sections of each part of the winding are displaced, with relation to each other, approximately 120 electrical degrees around the inner circumference of the stator. The result is that the adjacent conductors of each part of the windin`g,-that is to say those conductors located in the same slot, in the arrangement here shown, carry currents having a phase difference of 120 degrees. Similarly the sections of the other part of the winding extend over approximately 240 degrees and are displaced 120 degrees with relation to each 1 other.

The relation of the two parts is such that the associated sections which carry current of the same phase are displaced approximately 120 degrees. It will also be seen that, of the conductors in adjacent slots, two carry current of the same phase, while the other two carry currents having a phase difference of 120 degrees from each other and from the first. Thus the desired result has been obtained. The stator winding can be constructed as a loop or multiple circuit winding or as a wave winding (two circuitwinding).

It will be understood that, in the specification and claims, wherever I use the term degrees, I mean electrical degrees in distinction to space degrees.

In the form ofthe invention illustrated l in'Fig. 5 a stator compensating winding is provided for a six-pole machine the winding being a 'wave winding. In this figure letters ,corresponding to those used in Fig. 3 represent like parts, two parallel winding strands are used each of which forms a sixpole closed wave winding as will be seen by inspection of the drawings. These strands are indicated as before by lines of different thicknesses as explained in the table below Fig. 3. At the points a the two strands are cut open and arranged in series by means of the connections u, u2 its. The ends of thel windings which come to the terminals I, 1I and III are there connected to the mains and the brush currents jl, y', and j3 (see also Figs. l and 2) How through windings in thc directions indicated in the table referred to above so that a correct compensation is obtained as in Fig. 3.v If the stator compensating` winding shown in Fig. 5 be utilized with a drum armature rotor winding as shown in Fig. 2, the four conductors in the circle shown in Fig. 5 will compensate the six conductors shown in a circle in Fig. 2. It will be understood that this method may be extended in an analogous manner to any desired number of poles.

lVhat I claim as new and desire to secure by Letters Patent of the United States, is

l. In a three phase alternating current commutator machine, an evenly distributed compensating winding consisting` of a plurality of parts disposed as parallel strands, each part being cut iiiito sections, one section of one part being connected in series with a section of the other part and with a brush so that the brush current passes through the two sections in opposite directions.

2. In a three-phase alternating current commutator machine, an evenly distributed compensating winding consisting of two similar parts made up of coils of equal pitch, each part being cut into sections, one section of one part being connected in series with a section of the other part and with a brush, so that the brush current passes through the two sections in opposite directions.

3. .in e three-phase alternating current commutzitor machine, the combination with :i rotor provided Withzi drinn Winding, of c stator provided with an evenly distributed compensating winding, comprising two complete windings wound in opposite directions, each of seid windings being cut into scc ions, each section extending over apdegees, and displaced from each oi' the other sections of the same Winding approximately 120 degrees, and connected in series with e section of the other Winding which iSd-displaced therefrom approximately 120 degrees.

el. ln o, three 'phase alternating current corninntotor machine, the combination with a rotor provided with e drum winding, of e stator also provided with e, drum Winding, said stator Winding being divided into sections ond comprising two sections for each phase, each section 'being Wound over 240 degrees, and the two sections being relatively displaced by approximately 120 degrecs and Wound in reverse directions.

5. In a three-phase alternating current commutator machine, the combination with e rotor provided with e drum Winding, of e so stator provided with en evenly distributed compensating winding, comprising two complete windings, each made up of coils of equal pitch, these windings being Wound in opposite directions and each being cut into three sections, each section ci one Winding being connected in series with e section of the other Winding between e brush and c machine terminal, and those sections carrymg current of the' seme phase being dis- 

